CVE-2023-52476
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2023-52476
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-52476.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2023-52476
- Aliases
- Downstream
- Related
- Published
- 2024-02-29T05:43:09.475Z
- Modified
- 2026-01-06T15:13:04.405278Z
- Summary
- perf/x86/lbr: Filter vsyscall addresses
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
perf/x86/lbr: Filter vsyscall addresses
We found that a panic can occur when a vsyscall is made while LBR sampling is active. If the vsyscall is interrupted (NMI) for perf sampling, this call sequence can occur (most recent at top):
__insn_get_emulate_prefix() insn_get_emulate_prefix() insn_get_prefixes() insn_get_opcode() decode_branch_type() get_branch_type() intel_pmu_lbr_filter() intel_pmu_handle_irq() perf_event_nmi_handler()Within _insngetemulateprefix() at frame 0, a macro is called:
peek_nbyte_next(insn_byte_t, insn, i)Within this macro, this dereference occurs:
(insn)->next_byteInspecting registers at this point, the value of the next_byte field is the address of the vsyscall made, for example the location of the vsyscall version of gettimeofday() at 0xffffffffff600000. The access to an address in the vsyscall region will trigger an oops due to an unhandled page fault.
To fix the bug, filtering for vsyscalls can be done when determining the branch type. This patch will return a "none" branch if a kernel address if found to lie in the vsyscall region.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52476.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/3863989497652488a50f00e96de4331e5efabc6c
- https://git.kernel.org/stable/c/403d201d1fd144cb249836dafb222f6375871c6c
- https://git.kernel.org/stable/c/e53899771a02f798d436655efbd9d4b46c0f9265
- https://git.kernel.org/stable/c/f71edacbd4f99c0e12fe4a4007ab4d687d0688db
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52476.json
- https://nvd.nist.gov/vuln/detail/CVE-2023-52476
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced808b64565b028bd072c985624d5cbe4b6f5a5a35Fixed3863989497652488a50f00e96de4331e5efabc6cFixedf71edacbd4f99c0e12fe4a4007ab4d687d0688dbFixede53899771a02f798d436655efbd9d4b46c0f9265